Nouns

(n)forecaster, predictor, prognosticator, soothsayersomeone who makes predictions of the future (usually on the basis of special knowledge)
(n)predictorinformation that supports a probabilistic estimate of future events“the weekly bulletin contains several predictors of mutual fund performance”
(n)predictora computer for controlling antiaircraft fire that computes the position of an aircraft at the instant of a shell's arrival